Yes, I've had good results using MMS topical spray directly on the scalp. The mixture is 10 activated drops per 1 fl. oz. water (approx. 30 ml), put in a small spray bottle, then I spray through the hair directly on the scalp. After that, I massage it onto the scalp quickly and leave for a few minutes and wash it out. I'd consider doing this for twice a day for a couple of weeks, then once a day. The solution will remain active for up to 2 weeks (if it's still yellowish, it contains active chlorine dioxide).
You can also add a few drops (perhaps 2-10) per oz. of water of DMSO. This will carry the MMS through the skin into the tissues and the blood supply below. Always use careful observation and care when using unfamiliar substances for your wellness.
WARNING - Long term MMS topical spray on your hair CAN CHANGE the color of your hair in the direction of the blond range when used for longer than a few days.
MMS used this way can also help with hair loss.